Research on the Microstructural Characteristics and Performance Optimization of (Ti, Nb)C Composite Carbide Particle Reinforced Fe-based Material for Laser Additive Manufacturing

This research has applied laser melting deposition to obtain (Ti, Nb)C composite carbide particle reinforced phase in Fe-based materials. The microstructural characteristics and interface formation mechanism of (Ti, Nb)C/Fe have been analyzed in the study. Additionally, the effect of laser heat input on carbide precipitation has been investigated. Building on these results, the mechanical properties of the (Ti, Nb)C/Fe material have been optimized by adjusting processing parameters. The research results indicate that the material phase primarily consists of α-Fe matrix and (Ti, Nb)C composite carbide particle reinforcements. Moreover, with the increase in heat input, the size and area ratio of (Ti, Nb)C particles in the material significantly increase. The material strength demonstrates a trend of initially increasing and then decreasing with the rise in energy density. The peak strength is achieved at Eeff=105 J·mm-2.